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How to run your LS1 on E85
05-19-2008, 06:29 PM
#281
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Hay,
I just did my 1998 Z28 automatic too this past Saturday the 17th
12.7x @ 110MPH on 93 gasoline, "bolt-on" car.
I'm on stock 28.8# injectors right now, & have tested all out, with no power problems.
Injector duty cycle of 118 on top, 6,200RPM ...
but AFR ok....
Feels like 10-20 more HP. added 4 degrees everywhere.
On a full 1/4 mile pass I will be at 100 % + duty cycle for 1 second at the top of 1st gear, & 2 seconds at the top of 2nd gear, after looking at my log files...
I may just go to the track & try it...
I know that I shouldn't , but I did... until my new 42# injectors come in on Wednesday...
BUT, with the cooling effect of E85 Any stock 'bolt-on' LS1 should be able to get by with the stock 28.8# injectors, because how long are you really over 100%.....
100% duty cycle reached at 5,000 RPM.
I too have hard start/ cold idle issues that need addressed with cranking + cold idle tables.... anyone know which tables to change, & by how much....
I just did my 1998 Z28 automatic too this past Saturday the 17th
12.7x @ 110MPH on 93 gasoline, "bolt-on" car.
I'm on stock 28.8# injectors right now, & have tested all out, with no power problems.
Injector duty cycle of 118 on top, 6,200RPM ...
but AFR ok....Feels like 10-20 more HP. added 4 degrees everywhere.
On a full 1/4 mile pass I will be at 100 % + duty cycle for 1 second at the top of 1st gear, & 2 seconds at the top of 2nd gear, after looking at my log files...
I may just go to the track & try it...I know that I shouldn't , but I did...
until my new 42# injectors come in on Wednesday...BUT, with the cooling effect of E85 Any stock 'bolt-on' LS1 should be able to get by with the stock 28.8# injectors, because how long are you really over 100%.....
100% duty cycle reached at 5,000 RPM.
I too have hard start/ cold idle issues that need addressed with cranking + cold idle tables.... anyone know which tables to change, & by how much....
05-19-2008, 11:35 PM
#282
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No, duty cycle is over 100% starting at 5,000RPM as stock 28# injectors are maxed out on E85...
I need to see what others did too for correct crank/cold idle...
I need to see what others did too for correct crank/cold idle...
05-20-2008, 07:03 PM
#283
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I only repeat what I was told, by a member far more knowledgable than I, when my 42# injectors where seeing a duty cycle of 224%. It is physically imposible for an injector to flow more than what it can at 100% duty cycle. The duty cycle % is calculated from the various paramiters/values entered into the tune. If these values are incorrect then the calculation will reflect that with an innacurate duty cycle %. If your injectors hit 100% at 5000 rpm then would not get the correct amont of fuel past that. This is from ChrisB
Injector Pulewsidth(msec) * RPM / 1200 = Duty Cycle (in percent)
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https://ls1tech.com/forums/fueling-injection/833273-injector-duty-cycle-explained-good-stuff.html
Injector Pulewsidth(msec) * RPM / 1200 = Duty Cycle (in percent)
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https://ls1tech.com/forums/fueling-injection/833273-injector-duty-cycle-explained-good-stuff.html
Last edited by vaticano; 05-20-2008 at 07:14 PM.
05-21-2008, 09:21 AM
#284
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Runs like a raped ape...
It's getting correct fueling as my WB readings are a-ok....
Got to take it to the track for testing....
Anyone know what the AFR needs to be for the 1st 30 seconds
after start-up...
It's my only issue......
Some start-up tables need changed, don't know which ones...
It's getting correct fueling as my WB readings are a-ok....
Got to take it to the track for testing....
Anyone know what the AFR needs to be for the 1st 30 seconds
after start-up...
It's my only issue......
Some start-up tables need changed, don't know which ones...
05-21-2008, 09:34 AM
#285
I cant help cause Im no tuner but Im pretty sure Ive seen someone talking about the startup tables specificaly in this thread. I do know the fuel in general is harder to start then gasoline. esp. in the cold. but Im not sure how to get around that, or properly tune for it. hopefully when you find out you'll make it part of this thread. one day I will dable in tuning, and I'd like to use this thread and people's exp. tuning for E85 to help out.
Runs like a raped ape...
It's getting correct fueling as my WB readings are a-ok....
Got to take it to the track for testing....
Anyone know what the AFR needs to be for the 1st 30 seconds
after start-up...
It's my only issue......
Some start-up tables need changed, don't know which ones...
It's getting correct fueling as my WB readings are a-ok....
Got to take it to the track for testing....
Anyone know what the AFR needs to be for the 1st 30 seconds
after start-up...
It's my only issue......
Some start-up tables need changed, don't know which ones...
05-21-2008, 01:23 PM
#286
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05-21-2008, 01:30 PM
#288
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Look at the flex-trucks for a olfa that you can try out.
05-21-2008, 04:57 PM
#289
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It runs so well during all my testing, that I 'm going to try it at the track with the stock injectors.
AFR at WOT is a-ok, new at over 100% duty cycle...
05-21-2008, 09:00 PM
#290
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Just got back from test-&-tune at the track tonight.
Same ET/MPH as the last time that I was there 12.7x@109.x
Weather, [DA], was worst. Track not preped as well...
I think it's at least a tenth better the 93 gasoline..
I'm really thinking about not changing out the stock injectors...
Got to check my 4 log files tommorow to see where it's at...
Same ET/MPH as the last time that I was there 12.7x@109.x
Weather, [DA], was worst. Track not preped as well...
I think it's at least a tenth better the 93 gasoline..
I'm really thinking about not changing out the stock injectors...
Got to check my 4 log files tommorow to see where it's at...
05-23-2008, 05:41 PM
#291
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having an injector thats bigger then you need is never a bad thing. having them be to small is just a bad move. you can never be to safe when it comes to fuel delivery.
05-25-2008, 10:03 PM
#295
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Thankz for the info runn. I live in the states, Virginia to be exact we are a little slow in converting to E85. So my particular problem is that I may not be able to find E85 everywhere I go. Can I set my car up to run both regular fuel and E85?
05-26-2008, 02:36 PM
#297
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When i dont find any E85 i run gas which works fine if you drive carefully and no wots.
